D. Building their own roads from stone and clay
we study the government because it actually helps us in the future. for example it help us make good decisions when current events, economic and social problems directly effect you. it helps you apply your understanding when you are voting etc. hope it helped.
The crusades Greatly affected the feudal system and began to lose it hold on society which eventually led to the Renaissance. Knights had to sell their land to be able to live, due to the feudal system crashing. So if they were not able to make enough by selling their land, they were left broke. They were also forced to serve nobles in personal armies.
Reagan pushed Cold War tensions and military spending--his rhetoric convinced Americans there was still a serious threat from the USSR and therefore justified an increase to military spending which forced the USSR to respond contributing to their economic decline and eventual collapse.
